He may have been telling the truth about knowing where to find one. He had to have come from somewhere after all. But maybe he was also/instead trying to get information about the only person in the land still actively seeking out Steef, ie name and location. After all, self-preservation may require dealing with him one way or another in the future. This is a guy so paranoid that he was willing to undergo significant, full-body altering surgery to hide his identify, may have already sawn off/filed down his horns (and for all we know, had grafts to cover them up) and may have been planning more surgery in the future. When it comes to hiding, disguise and survival, Stranger's not one to deliberately leave loose ends.
Alternatively, someone cocked up, and this was an continuity error either from the original draft or left over after the sensible context was trimmed out.
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